Associated Press: Retired Gen. David Petraeus began an affair with his biographer in 2011, two months after he became CIA director, a friend and former top aide said Monday. The case has sparked an uproar in Congress over FBI investigative tactics and complaints by lawmakers they weren’t told soon enough about the probe rocking the intelligence and law enforcement establishment.

Petraeus had been scheduled to appear before congressional committees on Thursday to testify about the Sept. 11 attack on the U.S. Consulate in Benghazi, Libya, that killed four Americans, including U.S. Ambassador Chris Stevens. Morell was expected to testify in place of Petraeus, and lawmakers said he should have the answers to their questions.

But Feinstein and others didn’t rule out the possibility that Congress will compel Petraeus to testify about Benghazi at a later date, even though he’s relinquished his job.

Clapper was told by the Justice Department of the Petraeus investigation last week at about 5 p.m. on Election Day, and then called Petraeus and urged him to resign, according to a senior U.S. intelligence official who spoke on condition of anonymity because he was not authorized to discuss the investigation publicly.

FBI officials said the congressional committees weren’t informed until Friday, one official said, because the matter started as a criminal investigation into harassing emails allegedly sent by Broadwell to Kelley.

Concerned that emails Petraeus exchanged with Broadwell raised the possibility of a security breach, the FBI brought the matter up with him directly, according to the official, who spoke on condition of anonymity because he was not authorized to publicly discuss the investigation.

Petraeus decided to quit, though he was breaking no laws by having an affair, officials said.